11 APPARATUS FOR HEATING, REFRIGERATING AND WATER SUPPLY, NAMELY, TUBING, FITTINGS, PANELS, MANIFOLDS, WATER HEATERS, AND OTHER COMPONENTS; CENTRAL HEATING RADIATORS FOR HEATING BUILDINGS; HOT WATER EXPANSION TANKS FOR CENTRAL HEATING INSTALLATIONS AND RADIANT PANEL SYSTEMS; RADIANT PANEL HEATERS FOR RESIDENTIAL, COMMERCIAL AND INDUSTRIAL USE; HEAT ACCUMULATORS AND HEAT EXCHANGES, NOT BEING MACHINE PARTS HEAT PUMPS; HEATING APPARATUS, NAMELY, HYDRONIC HEATING SYSTEMS; HEATING ELEMENTS; HEATING INSTALLATIONS AND HOT WATER HEATING INSTALLATIONS; WATER HEATING INSTALLATIONS; PIPES BEING PARTS OF WATER HEATING INSTALLATIONS AND RADIANT PANEL SYSTEMS; RADIATORS FOR HEATING BUILDINGS; THERMOSTATIC VALVES BEING PARTS OF HEATING INSTALLATIONS; TAPS FOR WATER PIPES; WATER CONDUIT INSTALLATIONS FOR HEATING FLOORS, CEILINGS AND ROOFS; HYDRONIC FLOOR WARMING AND FLOOR HEATING SYSTEMS COMPRISED OF TUBING, FITTINGS, PANELS, MANIFOLDS, WATER HEATERS AND OTHER COMPONENTS; FITTINGS FOR WATER AND HEATING SYSTEMS, NAMELY BIBS, COCKS, TRAPS AND VALVES